staging:iio: Fix error handling in generic_buffer example

read() does not return -EAGAIN
read() returns -1 and the errno value needs to be checked for -EAGAIN

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
index 40d0ecac047f..044ea196aa6f 100644
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ b/drivers/staging/iio/Documentation/generic_buffer.c
@@ -305,9 +305,12 @@ int main(int argc, char **argv)
                 read_size = read(fp,
                                  data,
                                  toread*scan_size);
-                if (read_size == -EAGAIN) {
-                        printf("nothing available\n");
-                        continue;
+                if (read_size < 0) {
+                        if (errno == -EAGAIN) {
+                                printf("nothing available\n");
+                                continue;
+                        } else
+                                break;
                 }
                 for (i = 0; i < read_size/scan_size; i++)
                         process_scan(data + scan_size*i,